It was originally defined in CGS units in 1953 as the dose causing 100 ergs of energy to be absorbed by one gram of matter.
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This unit was found to be equivalent to 88 ergs in air.
It marked a shift towards measurements based on energy rather than charge.
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From 1977 to 1998, the US NIST's translations of the SI brochure stated that the CIPM had temporarily accepted the use of the rad (and other radiology units) with SI units since 1969.
However, the only related CIPM decisions shown in the appendix are with regards to the curie in 1964 and the radian (symbol: rad) in 1960. The CIPM's current SI brochure excludes the rad from the tables of non-SI units accepted for use with the SI.
The Röntgen equivalent physical (rep), introduced by Herbert Parker in 1945, but then promoted a switch to the gray in the 1970s.
The International Committee for Weights and Measures (CIPM) has not accepted the use of the rad.
This unit is obsolete and no longer clearly defined.
One roentgen deposits 0.877 rad in dry air, 0.96 rad in soft tissue, These conversions to absorbed energy all depend on the ionizing energy of a standard medium, which is ambiguous in the latest NIST definition.
In other situations, the effective dose in rem might be thirty times higher or thousands of times lower than the absorbed dose in rad.Tags: Adult Dating, affair dating, sex dating